That's pretty close to matching, but anonoymous heroes can hide their kindness and still keep it...(/excuse)
Generosity?
He who has it always shares itHe who sees it often gains itHe who hides it never keeps itHe who lacks it always needs itWhat is it?
Money!
[i mg]http://25.media.tumblr.com/b9c5aeca29fde7f4461b693c0983216a/tumblr_mioj0c9eqk1rwdbixo1_500.gif[/img]